Hot air gun



FIG. 1 is a side elevational view of a hot air gun, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom view thereof. 

The ornamental design for a hot air gun, as shown. 